Add Apache 2.0 license

[usmansalimLM]

Licenses @likeminds.community/chat-rn under Apache 2.0.

Changes

File	Change
LICENSE	new — canonical Apache 2.0 text
NOTICE	new — LikeMinds copyright attribution (required by Apache §4(d))
package.json	"license" changed from ISC to Apache-2.0
README.md	added a ## License section

Notes for the reviewer

The LICENSE file is byte-identical to https://www.apache.org/licenses/LICENSE-2.0.txt
(SHA-256 cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30). Please do not
reformat it or fill in the Copyright [yyyy] [name of copyright owner] placeholder in the
Appendix. That placeholder is part of the Appendix's instructions for applying the license,
not this repo's copyright notice. Editing the text causes GitHub and license scanners to
report the license as "Other" instead of "Apache-2.0". The repo's own copyright notice lives
in NOTICE.

The package.json change matters as much as the LICENSE file. npm consumers' license
scanners read the registry metadata, not this repo. It takes effect on the next published
version only; 1.10.0 and earlier keep ISC on npm permanently.

This is a relicense from ISC to Apache 2.0. Every contributor to this repo appears to be
LikeMinds staff, so this should be an internal decision, but please confirm before merging.

This PR does not change repository visibility. The repo stays private after merge.

Context

This package sits in the middle of the React Native chat dependency chain:

@likeminds.community/chat-rn-core   -> likeminds-chat-reactnative       (public)
└── @likeminds.community/chat-rn    -> likeminds-chat-reactnative-data  (this repo, private)
    └── @likeminds.community/chat-js -> likeminds-chat-js-data          (private)

All three need to be licensed and public for the React Native chat SDK to be usable as open
source. Companion PR: LikeMindsCommunity/likeminds-chat-js-data#107

Out of scope, flagged for a follow-up

package.json still declares "repository": "git+https://github.com/LikeMindsCommunity/ReactNative-Chat-Data.git",
which is this repo's old name and now returns 404. Left unchanged here to keep this PR to
licensing only.